Haha! Lots of good suggestions, cheers.
Electric shock treatment is tempting but I'll inevitably forget and fry myself at some point. Forgot about a disk lock once and that was painful enough.
We use lemon on any bitches that are in season (rub it on there bits)
Rub lemon juice on their bits? Sounds... stingy. Thanks for the link to the "get off" stuff.
I think I'll give the chain a good wash (has one of those fabric covers aswell... groan) and get squeezing with the lemons.... if that fails.... well, I might try some of the other suggestions!
This is all on the assumption it's a dog doing it... having met some of the residents round here, it might well be human. Hadn't thought about that lol